It's 0 because there are an infinite number of ways it could land, and
1 out of an infinite number of ways it could land is 0.  Why?

Because it's less than 1/100 because there are more than 100 ways 
it could land.  And:

it's less than 1/1000 because there are more than 1000 ways 
it could land.  And:

it's less than 1/1000000 because there are more than 1000000 ways 
it could land.  

If fact it's less than any positive number period!  So the only 
number that's less than any positive number that could be a 
probability is 0.

In other words, even though it's possible, it's practically impossible,
so whatever it is, it rounds off to 0.

Since nothing is absolutely perfect, the probability of anything being
exactly perfectly one way is zero.  That doesn't seem so strange when you
consider that nothing is absolutely perfect.

Edwin